Abstract
I spent a prime time of my youth in Pisa under the scholarship of Luigi Radicati. During this period, I was deeply impressed by his taste for the beauty of the symmetries in nature. I am particularly proud that his discovery of SU(6) symmetry in collaboration with Feza Gursey, which paved a road to the quark model with color symmetry, was nourished throughout the period of my sojourn in Pisa (1961-64). If I am allowed to reflect on a personal matter, it may not be an accident that I came across a theorem in axiomatic field theory, the simple connectedness of the analyticity region of the Wightman functions (the extended tubes) as a result of Lorentz symmetry. When Luigi visited Michigan in a later year, his interest had shifted towards astrophysical problems, such as neutron stars and gravitational waves. My interests also drifted in the same direction lately. In this article which is dedicated to the celebration of Luigi's 70th Birthday, we suggest that quantum effects on gravitational collapse are observable by the detection of gravitational waves. In fact, it will be shown that the gravitational wave signal recorded by the Rome and Maryland detectors at the time of the SN87A explosion, in coincidence with the Mont Blanc neutrino data, may be understood only by the property of quantum mechanical black hole. We wish Luigi have many more happy returns and contribute in unveiling the beauty of symmetry.
